1. Amethyst - Decision making and memory booster
2. Calcite - Stimulates insight and helps with analysis
3. Carnelian - Improves analytic abilities
4. Chalcedony - Opens the mind to new information
5. Fluorite - Helps you to organize information
6. Hematite - Aids concentration and focus
7. Tiger Eye - Helps you to collect scattered information, great for taking tests!